Quote:
Originally Posted by greenformula92
also keep in mind the oil pressure switch is in the fuel pump circut. The fuel pump relay is used to prime the injectors. once the engine is running and has oil pressure the it keeps the pump running. the ECM does not use the relay all the time. this is why when you have a bad fuel pump relay and you crank the car till it has enough oil pressure it will kick the pump on and it will fire.
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That is not 100% true. The oil pressure switch is a backup. you can remove the oil pressure switch and just use the fuel pump relay. I installed TPI into my 73 and tore apart the harness and removed the oil pressure relay and the system worked. The fuel pump relay is always energized from the computer as long as the car is running. Here are pictures of my install (I have since installed a Stealth Ram Intake)
